Difference between revisions of "RTL-SDR"
(alternative amixer version) |
(→Configure amixer) |
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==Configure amixer== | ==Configure amixer== | ||
+ | Audiomixer has different controls depending on the operating system version and configuration: | ||
===Version 1=== | ===Version 1=== | ||
+ | Audio controls: | ||
+ | [[amixer]] controls | ||
+ | |||
+ | numid=3,iface=MIXER,name='PCM Playback Route' | ||
+ | numid=2,iface=MIXER,name='PCM Playback Switch' | ||
+ | numid=1,iface=MIXER,name='PCM Playback Volume' | ||
+ | |||
Set jack (analog) output: | Set jack (analog) output: | ||
[[amixer]] cset numid=3 1 | [[amixer]] cset numid=3 1 | ||
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===Version 2=== | ===Version 2=== | ||
+ | Audio controls: | ||
[[amixer]] controls | [[amixer]] controls | ||
Latest revision as of 10:26, 7 January 2018
The RTL2832U & R820T is a software defined radio/tuner USB dongle capable of receiving 24 - 1766 MHz radio signals, including DVB-T.
You can use it with e.g. a Raspberry Pi or any other Debian based Linux to listen to FM radio.
Contents
Installation
Building from sources is not necessary any more...
apt-get install rtl-sdr
Configure amixer
Audiomixer has different controls depending on the operating system version and configuration:
Version 1
Audio controls:
amixer controls
numid=3,iface=MIXER,name='PCM Playback Route' numid=2,iface=MIXER,name='PCM Playback Switch' numid=1,iface=MIXER,name='PCM Playback Volume'
Set jack (analog) output:
amixer cset numid=3 1
Set HDMI output:
amixer cset numid=3 2
Set audio volume:
amixer sset "PCM" 90%
Version 2
Audio controls:
amixer controls
numid=4,iface=MIXER,name='Master Playback Switch' numid=3,iface=MIXER,name='Master Playback Volume' numid=2,iface=MIXER,name='Capture Switch' numid=1,iface=MIXER,name='Capture Volume'
Enable audio:
amixer cset numid=4 1
Set volume at 76%
amixer cset numid=3 50000
Verify:
amixer
Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 65536 Mono: Front Left: Playback 50020 [76%] [on] Front Right: Playback 50020 [76%] [on]
Test aplay
You should hear a kitten miaw...
aplay /usr/share/scratch/Media/Sounds/Animal/Kitten.wav
Listen to FM Radio
Tune into an FM radio station:
rtl_fm -f 91.7e6 -s 200000 -r 48000 |aplay -r 48000 -f S16_LE